【摘要】 用倒置显微镜及闭路电视观察11只兔耳窗内68个动静脉吻合的形态。根据其静脉端的数目及其与动脉的连结形式,分为4型:Ⅰ型58.8％,Ⅱ型19.4％,Ⅲ型11.1％,Ⅳ型10.7％。动静脉吻合的内径:动脉端为36.6±1.67μm,中间段(狭窄部)为16±0.6μm,静脉端为66±4μm。 5只兔在非麻醉状况下,用55℃的热水注入硬膜外腔内加温。兔耳窗内动静脉吻合随椎管内温度升高及脊髓加温而逐渐开放。当动静脉吻合充分开放后,兔耳温度继续升高时,毛细血管亦随之开放。更多还原

【Abstract】 Using inverted microscopy and circuit TV, the morphological type, diameter of arteriovenous anastomoses (AVAs) in 11 rabbit’s ear chambers were observed. According the joining forms with arterioles and venules in 68 AVAs, there were 4 types: type Ⅰ 58.8％, type Ⅱ 19.4％, type Ⅲ 11.1％, type ⅣV 10.7％. The inner diameters of the AVAs when dialated, measured 36.6±1.67μm at their arterial ends, 16+0.6μm at their narrow points, 66±4μm at their venous ends.This study showed that dilation of AVAs in the rabbit’s ear is a graded response which correlates with the rise in intravertebral canal temperature. Some AVAs have multiple venous segments which vary in diameters. It was observed that the behaviour were different after intravertebral canal warming.更多还原